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Abstract

Future Internet and Ethernet technologies will be affected by both limited
bandwidth of information infrastructure and its high energy consumption. In
order to solve both problems simultaneously, in this invited paper, we describe
several hybrid coded-modulation (CM) schemes enabling multiterabit optical
transport including spatial-domain-based CM, mode-multiplexed 4-D CM, and
mode-multiplexed generalized orthogonal frequency division multiplexing. A
common property of these CM schemes is the employment of optimized signal
constellations, various degrees of freedom, and rate-adaptive coding. These
modulation schemes are called hybrid as all available degrees of freedom are
used for transmission over optical fibers including amplitude, phase, polarization,
and orbital angular momentum. Since the channel capacity is a linear function
in number of dimensions, by increasing the number of basis functions, we can
dramatically improve the overall system capacity. The energy-consumption problem
is tackled by properly designing multidimensional signal constellations such
that transinformation is maximized, while taking the energy constraint into
account.

References

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